/*
 * Copyright (c) 2009 John Pritchard, WTKX Project Group
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package wtkx.in;

import java.awt.Component;
import java.awt.Container;
import java.awt.KeyboardFocusManager;

/**
 * 
 * @author jdp
 */
public final class FocusTP
    extends java.awt.FocusTraversalPolicy
{
    public final static FocusTP Instance = new FocusTP();




    private FocusTP(){
        super();
    }


    public final FocusTP install(){
        KeyboardFocusManager fm = KeyboardFocusManager.getCurrentKeyboardFocusManager();
        if (null != fm){
            Container root = fm.getCurrentFocusCycleRoot();
            if (null != root)
                root.setFocusTraversalPolicy(FocusTP.Instance);
        }
        return this;
    }

    public Component getComponentAfter(Container parent, Component child){
        if (0 < parent.getComponentCount())
            return parent.getComponent(0);
        else
            return parent;
    }
    public Component getComponentBefore(Container parent, Component child){
        if (0 < parent.getComponentCount())
            return parent.getComponent(0);
        else
            return parent;
    }
    public Component getFirstComponent(Container parent){
        if (0 < parent.getComponentCount())
            return parent.getComponent(0);
        else
            return parent;
    }
    public Component getLastComponent(Container parent){
        if (0 < parent.getComponentCount())
            return parent.getComponent(0);
        else
            return parent;
    }
    public Component getDefaultComponent(Container parent){
        if (0 < parent.getComponentCount())
            return parent.getComponent(0);
        else
            return parent;
    }
}
